I could not find much technical details about the drone, but since I discovered it via Atmel on Google+, I assume some soon-to-be Microchip AVR MCUs might be involved. It flies like any quadcopter, then it can land on water and move sideways with the blades rotating in the air. The submerged mode is interesting. The drone fills itself with water until the blades are under water, and then rotates 90 degrees to roam in the water. Once it’s done it ejects the water to get back to the surface. The drone is also equipped with camera and sensors to explore its surroundings.